Added L and A keys to interface, to loop single / all. Also show loop status on UI.

[Erhannis]

Often, when I'm listening to music, I'll stop in the middle and just want to loop the current song until I feel like moving on. So I added keys to toggle the loop mode without exiting the program.

So it shows like:

commands:  [p]revious subsong   [n]ext subsong   loop [a]ll    [q]uit player
           [ ] pause/resume   [1-4] mute channel [l]oop single

Song  10/ 30 [Loop single] (Untitled)
00:06/02:00  A-4 %%-   F-3 %%-   C-3 %%%   ---       [ =%%|%%= ]

[codecov[bot]]

Codecov Report

Merging #74 (4777dc1) into master (b15f500) will decrease coverage by 0.41%. The diff coverage is 0.00%.

:exclamation: Current head 4777dc1 differs from pull request most recent head 1d44ed9. Consider uploading reports for the commit 1d44ed9 to get more accurate results

Impacted Files	Coverage Δ
gbsplay.c	36.36% <0.00%> (-3.25%)	:arrow_down:
player.c	38.98% <0.00%> (-1.44%)	:arrow_down:
gbs.c	30.05% <0.00%> (-1.15%)	:arrow_down:
cfgparser.c	80.17% <0.00%> (+0.48%)	:arrow_up:
mapper.c	48.27% <0.00%> (+5.27%)	:arrow_up:

[mmitch]

Good idea!

1. If you toggle a screen refresh after pause has been toggled, will that actually display the "Pause" status?
2. What about using the l key to cycle through the loop modes none, single and all? Would that be inconvenient to you?

I think internally we should refactor to a loop enum instead of two booleans anyway because setting both loop modes at the same time makes no sense as discussed here. But I'd do the refactoring after this pull request, we don't have to mix these two things here.

[Erhannis]

Thanks - and:

1. Well, I tried copying some of the presumable redraw code to just after the toggle_pause call. It seems to work; can you verify there's no weird side effects you expect to occur as a result of the change?
2. And sure; done.

[ranma]

Do you mind rebasing your pull request against current head? Thanks!

[Erhannis]

Rebasing is pretty weird for me; I prefer merges; but I think I've done it correctly. I've updated my code to deal with the loop mode changes - [Loop all] loops over the range, if one was specified, and everything else seems to behave pretty much as you might expect.

[mmitch]

Sorry for being late. As I see it, with ranmas commit c775085 most if this branch is already in master and the only thing missing is the pause display stuff. Is that correct?

Should I try to cherry-pick the remaining changes? (I don't know if that is possible from a remote repository; also commit 7f9672a contains both the loop handling and the pause mode display when I only need the latter. Commit 3dccade would be cherry-picked as a whole.)

[Erhannis]

I've put the changes into a single commit and made pull request https://github.com/mmitch/gbsplay/pull/79

[mmitch]

Thanks a lot! I've merged #79, so I'm closing this issue.